Скачать или смотреть BISOPE series 44 Point, Line, and Planesquare sound sources distance attenuation

BISOPE series 44- Point, Line, and Plane(square) sound sources (distance attenuation)
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A sound source is a source that generates sound power. If sound sources are classified in the form of poles, they can be classified into monopole, dipole, and quadrupole sound sources. Among them, a point source is a source that is radiated forming a spherical wave from a small sphere that periodically expands and contracts as a result of a change in volume, and is also called a monopole source. In addition, when countless point sources form a straight line, this form like a train is called a line source.
The power radiated from the sound source decreases linearly in the area that can be assumed to be a free sound field (an area that is not very close to the sound source and the sound pressure decreases uniformly as the distance increases). '. In other words, the farther the distance, the quieter the sound. However, the attenuation ratio of the sound power according to the distance is different depending on the shape of the sound source. That is, points decay quickly and lines decay slowly. explain this

distance attenuation according to the sound source

point, line and plane are explained by speaker, train and wall.


Point source Line source Square(Plane) source
Form
Occurrence example Explosion, combustion, 1 car, speaker (far) Traffic noise (train, road) radiation on the wall. speaker (near)
according to the distance from the source Point source (spherical wave) -
Distance attenuation (assuming a free sound field) Apply the inverse square law.
6dB attenuation at twice the distance Apply the inverse law
3dB attenuation at twice the distance Depending on the distance generated from a circular surface sound source or a rectangular surface sound source. (point sound source in case of long distance)

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